peek at solution solve puzzle
quality: difficulty: solvability: moderate lookahead
Puzzle Description Suppressed:Click below to view spoilers
#1: Josh Greifer (joshgreifer) on Apr 5, 2010 [HINT] [SPOILER]
Comment Suppressed:Click below to view hints and spoilers#2: Logan J. Huorli (evillttlimp) on Apr 5, 2010 [HINT]
Comment Suppressed:Click below to view hints#3: paul dahmer (paul) on Apr 6, 2010
great puzzle - this is what this web site should be for - hard puzzles, not those colourful crappy things with too many spaces filled in that there is no skill needed - this is a PUZZZZZZZZLE site, not a picture site.#4: Victor Cervantes (iqvictor) on Apr 7, 2010
Me encanto, la verdad es que aplicando simple logica se resuelve y ya entendiendo el sentido se va resolviendo solo, felicidades!#5: Teresa K (fasstar) on Apr 10, 2010 [HINT]
Comment Suppressed:Click below to view hints#6: Web Paint-By-Number Robot (webpbn) on Apr 13, 2010
Found to have a unique solution by jan.#7: Web Paint-By-Number Robot (webpbn) on Apr 13, 2010
Found to be logically solvable by jan.#8: Jan Wolter (jan) on Apr 14, 2010 [HINT] [SPOILER]
Comment Suppressed:Click below to view hints and spoilers#9: Jan Wolter (jan) on Apr 14, 2010 [HINT]
Comment Suppressed:Click below to view hints#10: Josh Greifer (joshgreifer) on Apr 16, 2010 [HINT]
Comment Suppressed:Click below to view hints#11: Jan Wolter (jan) on Apr 17, 2010
Thanks.#12: Jan Wolter (jan) on Apr 20, 2010
If you're interested in my survey, it's here: http://webpbn.com/survey/
If you want test data for your solver, or want me to test it against the others, I'm happy to do so. It's getting to be a pretty competitive business though.
I actually did the comparison of different solvers on variously scaled versions of this puzzle and wrote it up.#13: Kristen Vognild (Kristen) on Mar 8, 2012
It's here: http://webpbn.com/survey/dom.html
I think this is a fun thing to put up as a challenge to designers of solvers.
I enjoyed this one, because the "aha!" came fairly quickly. If I hadn't found the solution right away, I would probably hate this puzzle. ;)#14: Martha Valdés (maval) on May 19, 2012 [SPOILER]
Comment Suppressed:Click below to view spoilers#15: Jan Wolter (jan) on Jul 25, 2012
Here's a link to a PDF of an Australian research paper called "MDD Propogators with Explanation". On page 17 you'll see a picture of this puzzle. They can solve up to size 20, which is way better than I've seen anyone else do.#16: Dave Oas (khpdave) on Nov 2, 2012 [SPOILER]
So this puzzle is now officially part of SCIENCE.
Comment Suppressed:Click below to view spoilers#17: Deborah Eater (cricketswool) on Apr 17, 2017
Great puzzle! I'm still struggling to get beyond line logic and this one helped me a lot.#18: Brian Bellis (mootpoint) on Dec 27, 2018
I'm sorry to say that I "intuited" the solution and solved in about a minute. This was obviously meant to be a fun and tricky solve but I just gave it a lucky guess.#19: Peter Wentworth (cspwcspw) on Aug 13, 2022 [HINT]
Comment Suppressed:Click below to view hints
You must register and log in to be able to participate in this discussion.